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-4(z-12)=49
We move all terms to the left:
-4(z-12)-(49)=0
We multiply parentheses
-4z+48-49=0
We add all the numbers together, and all the variables
-4z-1=0
We move all terms containing z to the left, all other terms to the right
-4z=1
z=1/-4
z=-1/4
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